Ambien is a sedative, which limits brain activity. If you take a specific amount, it can interfere with high level brain activity while having limited impact on low level activity.
The higher levels of brain activity such as conscious activity and memory require lots of specific complex types of brain activity. So, the sedative can limit/stop high level conscious activity and memory formation.
But it might not be enough to seriously limit or stop low level activity around walking, or emotion-based actions, etc. Lower level activity is simpler in terms of neural activity and more hard wired so can still function to some extent even when sedated.
So you might get someone making a racist tweet as the emotion based part of brain is still working, whereas the high level self control and memory part of the brain are seriously impaired.
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